After the battle plan briefing, Aaron can be located outside on the emergency stairway fending off zombies and infected crows. After his death, he will drop a Shotgun (NORMAL mode) or a Handgun with eight rounds (HARD mode).

Aaron can be unlocked simply by clearing "Outbreak" scenario on any difficulty. He comes in a set with Raymond and Arthur. After doing so he can be purchased for 5000pts. In File #2 he is unlocked from the start and can be bought for 500pts. Data Convert may be used to bypass purchasing him in one of the games. (as any purchases made are transferred to the other game as already bought)